You might want to look at this:
The truth is that 20/20 was an anomalous year for elections because of covid, and because of the different rules states established for elections. It made the normal Democrat get out the vote drives much easier because they didn't have to drive people to the polls like they normally do. I know because I've been an observer and seen it. They just had to get them to open their mail. And they focused those efforts on urban districts because the greater population density meant it was easier to get more votes with the same amount of door to door effort.
Of course there was some fraud. The problem is that it is impossible to quantify how much of the unusual Democratic turnout was due to fraud, and how much was due to the rules that made voting much easier.
The entire argument that different voting patterns in 2020 proved fraud is simply ridiculous.